CN101329072B - Rear step type flame holder for rotor engine - Google Patents
Rear step type flame holder for rotor engine Download PDFInfo
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- CN101329072B CN101329072B CN2008101149766A CN200810114976A CN101329072B CN 101329072 B CN101329072 B CN 101329072B CN 2008101149766 A CN2008101149766 A CN 2008101149766A CN 200810114976 A CN200810114976 A CN 200810114976A CN 101329072 B CN101329072 B CN 101329072B
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- type flame
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Abstract
The invention discloses a rear-setback flame stabilizer used for a rotor engine which comprises a step head, step plates with curvature, a step head mounting base, a step bottom mounting base and a fuel tube; a centrifugal nozzle is arranged on a nozzle mounting base at the top of the fuel tube and then is arranged together with the step head, and then the atomization adopts the centrifugal nozzle for injection; a bracket formed by the step head mounting base and step bottom mounting base fixes the step head and the step plates with curvature on a high level position, and the rear-setback flame stabilizer is fixed on a rotor through the step bottom mounting base thus leading the rear-setback flame stabilizer to rotate together with the rotor. The invention can provide a stable high-level fire supply for the combustion system of the rotor engine so as to guarantee that the whole combustion system is provided with wide and stable work scope and higher combustion efficiency; simultaneously the structure of the invention is simple.
Description
Technical field
The present invention relates to a kind of flame stabilizer of rotary engine, can be for main combustion stage provide stable incendiary source under the condition of strong centrifugal force effect, guaranteeing can stability and high efficiency burned flame stabilising arrangement-rear step type flame holder under the high speed rotating condition.
Background technology
External having developed at present a kind ofly collects Ramjet Technique and the gas-turbine unit technology is the new concept engine-stamping rotor engine of one.This kind engine can be divided into two classes: a class stamping rotor engine is to adopt stamping rotor compressed air, burns immediately following combustion chamber and turbine thereafter and does work; Another kind of is to realize gas compression, burning and the acting of expanding on a rotor.U.S. Ramgen company has all carried out research and operation test at this two classes stamping rotor engine, and its main purpose still is applied in stamping rotor engine the industry gas turbine aspect power is provided, and all adopts gaseous fuel.
The second class stamping rotor engine particularly, it is punching press model, combustion chamber and jet pipe to be installed in form the punching press propulsion die on the rotor wheel rim, to realize air compression, burning and the acting three big functions that expand, become a rotor motor that works alone.Because combustion system is followed the rotor high-speed rotation, its import incoming flow relative velocity height will be realized the efficient stable burning, and burning organizational form, reliable steady ignition technique and gas sealing etc. have been proposed new challenge.
Ramgen company (GT-2002-30084) adopts gaseous fuel (natural gas+hydrogen) successfully to realize igniting, punching press and stable operation in epitrochanterian combustion chamber.For reliably steady burning things which may cause a fire disaster is provided to the combustion chamber, Ramgen company adopts three kinds of retention flame modes on rotor: wall backward step mode, vortex generator+wall backward step mode and beacon flameholder mode.Wall backward step flameholder is to rely on the local low speed recirculating zone in the whirlpool in the step to form the point of safes burning things which may cause a fire disaster, high-temperature combustion product is propagated into fresh incoming flow, to light shear layer, but the blending of ignite gas and mainstream gas is very poor, the major part gas that ignites has directly entered the recirculating zone, cause this place's richextinction, under centrifugal effect and gas concentration distribution acting in conjunction, flame is to the combustion chamber off-centring.And vortex generator makes the combustion zone radial expansion by the blending that the generation vortex strengthens ignite gas and main flow, but blending intensity and flameholding sexual needs balance, excessive may causing of turbulivity stops working.The beacon stabilizer can provide fuel system flexibly, radially obviously strengthening combustion intensity, can increase flame surface area and heat liberation rate, heat release rate, provide that more uniform temperature distributes, higher combustion intensity and chamber pressure, but currently used beacon plugging rate is too small, and exhibition is abundant inadequately to expansion in the combustion zone.
Combustion system on the rotary engine is rotated with rotor high-speed, can produce strong centrifugal force field, and the buoyancy lift effect of thereupon giving birth to, and this distribution and flame propagation to fuel will exert far reaching influence.The second class stamping rotor engine experimental study also shows, when this engine speed when 2000rpm is above, its centrifugal acceleration is more than 3800g, along with combustion chamber centrifugal force increases and residence time decline, shear layer flame holding variation, have only the local residence time in the recirculating zone to be beneficial to burning, and its operate as normal rotating speed reaches 4300rpm, this moment, centrifugal acceleration was up to 17600g.And Ramgen company still adopts the higher gaseous fuel of rate of flame propagation, if adopt liquid fuel, for example aviation kerosine etc. will be bigger to its combustibility influence.In addition, the more very important Ramgen of being company flameholder on carrying out rotor is not considered the influence of centrifugal effect to flame propagation when designing, this has caused the flame of pre-combustion grade under high centrifugal acceleration to burn in the place of being close to wall, the bad stability of flame, efficiency of combustion reduces.
Therefore, on rotary engine, the rotor speed height, the air-flow relative Mach number reaches more than 0.2, the burning indoor air flow has centrifugal force field, and centrifugal acceleration reaches 1000g～50000g, and high flow rate and high centrifugal force field bring very large difficulty for the flame stabilization in the combustion chamber, when flameholder is designed, take into full account of the influence of the centrifugal effect of rotation generation to liquid mist and flame propagation.The domestic patent (patent No.: 200710176096.7) introduced tower type flame holder for rotor engine about high-order flameholder, but this tower type flame holder for rotor engine has significant limitation: at first, its structure more complicated, processing request precision height; Secondly, the air velocity adjustable extent of combustion chamber is narrow, can not be applied to the situation of high Ma number; Have, simple nozzle is adopted in fuel-oil atmozation again, the non-constant of the atomization of fuel oil, and the bad stability of burning, the stable operation range of combustion chamber narrows down etc.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of rear step type flame holder that is applicable to rotary engine is provided, in that to take into full account centrifugal effect simple in structure to accomplishing in the flame propagation influence, and can make the stability and the efficiency of combustion of burning be improved simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: described backward step flameholder places the outer casing of combustion chamber and the interior casing of combustion chamber, and it comprises stepped plate, step head mount pad, step bottom mount pad and the oil pipe of step head, band curvature; Swirl atomizer is installed on the nozzle mount pad at top of oil pipe, is installed together with the step head then, and atomizing type adopts swirl atomizer to spray; The bearing that step head mount pad and step bottom mount pad are formed is fixed on a high position with the stepped plate of step head and band curvature, and the backward step flameholder makes the backward step flameholder rotate with rotor by on the mount pad fixed rotor of step bottom.
Principle of the present invention is as follows: separated up and down the windward side of step head after the combustion chamber mainstream gas was flowed through, upper air is flowed through and is formed local low speed recirculating zone in the whirlpool on the stepped plate top of step back of head and band curvature behind the step head, owing to can produce very strong centrifugal force effect on the high speed rotor rotated, set up one stable flame in a high position, this flame is under the influence of strong centrifugal force effect, the effect that is subjected to buoyancy lift is propagated towards the direction in the center of circle, increased the radially area coverage of flame, for the main combustion stage of low level provides the point of safes burning things which may cause a fire disaster, consider that simultaneously the stabilizer stable operation range is wide, when simplifying the structure, can improve the stability and the efficiency of combustion of burning.
The advantage that the present invention is compared with prior art had is as follows:
(1) rear step type flame holder used of rotary engine of the present invention, made full use of the strong centrifugal force effect that the rotor high-speed rotation produces, help the diffusion diametrically of high-order flame to propagate, for providing, the low level main combustion stage continues steady burning things which may cause a fire disaster, flame surface area and heat liberation rate, heat release rate have not been increased having obviously to increase under the situation of steady firearm blocked area, simultaneously simple in structure, thus the combustion stability of assurance combustion chamber has improved efficiency of combustion.
(2) rear step type flame holder used of rotary engine of the present invention, the stepped plate arc length of band curvature and the ratio of shoulder height can be adjusted within the scope of setting flexibly, and then form stable local low speed recirculating zone in the whirlpool, thereby a stable incendiary source further is provided, has further guaranteed the stability of burning.
(3) rear step type flame holder used of rotary engine of the present invention adopts oil pipe integrated, promptly on the oil pipe atomizer is installed, and has solved the sealing problem of fuel oil effectively.Adopt better atomized fuel of swirl atomizer, widened the stable operation range of combustion chamber.
(4) in addition, the rear step type flame holder that rotary engine of the present invention is used, the height of the high-order point of safes burning things which may cause a fire disaster of change of the high flexible of mount pad bottom can passing through to regulate, thus can adapt to different chamber passages.
(5) in addition, the rear step type flame holder that rotary engine of the present invention is used has adopted suitable blockage ratio, has effectively reduced aerodynamic loss, thereby has improved efficiency of combustion.
(6) and the rear step type flame holder used of rotary engine of the present invention, the design of chamfering is all adopted in head and base windward side, reduces aerodynamic drag.
Description of drawings
Fig. 1 is the work schematic diagram of rear step type flame holder on rotary engine;
Fig. 2 is the overall structure cutaway view of rear step type flame holder;
Fig. 3 is the step header structure cutaway view of rear step type flame holder;
Fig. 4 is the step head support structure cutaway view of rear step type flame holder;
Fig. 5 is the step bottom support bracket structure cutaway view of rear step type flame holder;
Fig. 6 is the vitta structure cutaway view of rear step type flame holder.
Wherein 1 is combustion chamber main flow air-flow, the 2nd, and by the air-flow of backward step flameholder, the 3rd, fuel is supplied with, the 4th, backward step stabilizer thermal-flame, the 5th, primary zone, the 6th, recirculating zone in the backward step, the 7th, nozzle mist of oil, the 8th, outer combustion case, the 9th, casing in the combustion chamber, the 10th, rear step type flame holder, the 11st, the rear step type flame holder top is apart from the distance of burning gallery upper wall surface, the 12nd, shoulder height, the 13rd, the arc length of band curvature stepped plate, the 14th, step head, the 15th, the stepped plate of band curvature, the 16th, step head mount pad, the 17th, step bottom mount pad, the 18th, oil pipe, the 19th, swirl atomizer, the 20th, the oil pipe passage, the 21st, step head windward side, the 22nd, step head height degree, the 23rd, step head mount pad windward side, the 24th, step head mount pad installing hole, the 25th, step bottom mount pad installing hole, the 26th, mount pad windward side, step bottom, the 27th, step bottom mount pad height, the 28th, wheel rim is installed screwed hole, the 29th, nozzle mount pad.
The specific embodiment
Introduce the present invention in detail below in conjunction with the drawings and the specific embodiments.
Rear step type flame holder is installed on the rotary engine, as shown in Figure 1; On rotary engine, casing 9 together rotates with rotor in the combustion chamber, and angular velocity of rotation is ω, and outer combustion case 8 also can be actionless because the difference of rotary engine structure design can be to rotate with rotor; Combustion chamber main flow air-flow 1 flows into the combustion chamber with certain relative velocity, and the relative Mach number of this air-flow is more than 0.2 in the present typical stamping rotor engine; During step head 14 in the rear step type flame holder 10 of flowing through, the air-flow 2 of backward step flameholder of flowing through is shunted up and down at 21 places, step head windward side, upper air forms local low speed recirculating zone in the whirlpool 6 on stepped plate 15 tops of step head 14 rear portions and band curvature, this low speed recirculating zone is stable, have stronger steady fiery ability, the stable operation range of rotary engine is had the effect of widening; The fuel of rear step type flame holder 10 is supplied with 3 and is entered by the lower port of rotor wheel rim from oil pipe 18, because whole combustion chamber together rotates with rotor, reference frame is fixed on the rotor, then has the high centrifugal force effect in the combustion chamber on the rotor wheel rim, its centrifugal acceleration is G=R ω
2Because the existence of this high centrifugal force effect, can make air-flow produce barometric gradient diametrically, and then to high-temperature fuel gas generation buoyancy lift effect, the high-order flame 4 of pre-combustion grade stabilizer high temperature is propagated from the low level district of a high position to inside radius, strengthened the radial propagation of flame, also produce with the main combustion stage fuel that ejects from the low level district and intersects blending, help lighting and smooth combustion, mainly combustion process 5 is finished in the primary zone.
As shown in Figure 2, rear step type flame holder 10 of the present invention includes step head 14, the stepped plate 15 of band curvature, step head mount pad 16, step bottom mount pad 17 and oil pipe 18,19th, swirl atomizer.Step bottom mount pad 17 is fixed on backward step flameholder 10 on the rotor wheel rim, as shown in Figure 1.Step head mount pad 16 is in order to the stepped plate 15 and the step head 14 of fixed band curvature.Can produce centrifugal force during rotor rotation, step head mount pad 16 and step bottom mount pad 17 can be subjected to movement load, can adopt the method for finite element analysis to calculate rotor top bar head mount pad 16 and the stress distribution of step bottom mount pad 17 under different rotating speeds in design, the strength degree of bond material is determined the structural strength of mount pad.
Erection sequence of the present invention: swirl atomizer 19 is installed on the nozzle mount pad 29 of oil pipe 18, be inserted in then in the step head 14 and make it to become one, oil pipe 18 is inserted in the oil pipe passage 20 of step head peace transposase 11 6 and step bottom mount pad 17, and the stepped plate 15 of step head mount pad 16 and step head 14 with band curvature be connected and fixed, step head mount pad 16 and step bottom mount pad 17 is carried out bolt by step head mount pad installing hole 24 and step bottom mount pad installing hole 25 be connected and fixed, by wheel rim threaded mounting hole 28 backward step flameholder 10 is fixed on the rotor at last.
The principal element that influences the steady fiery effect of rear step type flame holder 10 has three, is respectively the distance 11 of rear step type flame holder top apart from the burning gallery upper wall surface, shoulder height 12, the arc length 13 of band curvature stepped plate.Make rear step type flame holder can behind step, produce recirculating zone 6 in the complete step, need to guarantee that the arc length 13 of band curvature stepped plate and the ratio of shoulder height 12 are 4～6.As shown in Figure 2, come the rear step type flame holder top is regulated apart from the distance 11 of burning gallery upper wall surface by adjustment to step bottom mount pad height 27.Shoulder height 12 is regulated by adjusting step head height degree 22.Come the arc length 13 of accommodation zone curvature stepped plate by the stepped plate of changing different band curvature.
As Fig. 4 and Fig. 5, be connected by step head mount pad installing hole 24 bolt between the mount pad installing hole 25 bottom step between the mount pad 17 of step head mount pad 16 and step bottom and fix.Step bottom mount pad 17 is installed screwed hole 28 with the rotor wheel rim by wheel rim and is fixed.
As Fig. 2 and Fig. 6, device nozzle mount pad 29 on the oil pipe 18; Oil pipe 18 devices are in oil pipe passage 20 inside, and nozzle mount pad 29 devices are in step head 14 inside, and atomizing type adopts swirl atomizer 19; Swirl atomizer 19 adopts engage thread to be connected and fixed with nozzle mount pad 29; The fuel of rear step type flame holder 10 is supplied with 3 and is entered swirl atomizer 19 by oil pipe 18 from nozzle carrier from oil pipe, and swirl atomizer 19 atomized fuels form nozzle mist of oil 7.
Rotary engine uses the blockage ratio of rear step type flame holder 10 in 0.25～0.5 scope, and the blockage ratio of flameholder is meant the front face area of flameholder and the ratio of the cross-sectional area of combustion chamber; Simultaneously, the present invention is for fear of causing air current flow loss, with step head windward side 21, and step head mount pad windward side 23, mount pad windward side, step bottom 26 is designed to chamfering, helps reducing flow resistance.
In the concrete case study on implementation, the employing aviation kerosine is a fuel, the rear step type flame holder blockage ratio is 0.3, the distance of rear step type flame holder top casing outside burning gallery is 15mm, the arc length of band curvature stepped plate and the ratio of shoulder height are 5: 1, wherein with the arc length 100mm of curvature stepped plate, shoulder height is 20mm, step head height degree is 18mm, step head bottom mount pad height is 15mm, step head windward side chamfer radius is 20mm, and the chamfer radius of step head mount pad windward side and mount pad windward side, step bottom is 5mm.The spraying subtended angle of the swirl atomizer that adopts is 60 °.
Claims (10)
1. the rear step type flame holder used of rotary engine, it is characterized in that: described rear step type flame holder (10) places between the interior casing (9) of the outer casing (8) of combustion chamber and combustion chamber, and described rear step type flame holder (10) comprises stepped plate (15), step head mount pad (16), step bottom mount pad (17) and the oil pipe (18) of step head (14), band curvature; Swirl atomizer (19) is installed on the nozzle mount pad (29) at top of oil pipe (18), is installed together with step head (14) then, and atomizing type adopts swirl atomizer (19) to spray; The bearing that step head mount pad (16) and step bottom mount pad (17) are formed is fixed on a high position with the stepped plate (15) of step head (14) and band curvature, rear step type flame holder (10) makes rear step type flame holder (10) rotate with rotor by on mount pad (17) fixed rotor of step bottom.
2. the rear step type flame holder that rotary engine according to claim 1 is used, it is characterized in that: the arc length (13) of the stepped plate of described band curvature (15) and the ratio of shoulder height (12) are between 4～6, described shoulder height (12) comprises the height (22) of step head (14), and step head mount pad (16) connects the height of the wall of step head (14) and band curvature stepped plate (15).
3. the rear step type flame holder that rotary engine according to claim 2 is used is characterized in that: described shoulder height (12) is regulated by the height (22) of adjusting step head (14).
4. the rear step type flame holder that rotary engine according to claim 1 and 2 is used is characterized in that: the arc length (13) of described band curvature stepped plate (15) is regulated by the stepped plate (15) of transposing band curvature.
5. the rear step type flame holder that rotary engine according to claim 1 is used, it is characterized in that: described step bottom mount pad (17) can be regulated, and is used to adjust rear step type flame holder (10) top apart from the distance (11) between the outer combustion case (8).
6. the rear step type flame holder that rotary engine according to claim 1 is used is characterized in that: described oil pipe (18) is supplied with (3) fuel feeding from the bottom by fuel.
7. the rear step type flame holder that rotary engine according to claim 6 is used is characterized in that: it is liquid fuel that described fuel is supplied with the fuel that (3) is adopted.
8. the rear step type flame holder that rotary engine according to claim 1 is used is characterized in that: described swirl atomizer (19) adopts engage thread to be connected and fixed with nozzle mount pad (29).
9. the rear step type flame holder that rotary engine according to claim 1 is used is characterized in that: the scope of the obstruction ratio of described rear step type flame holder (10) is 0.25～0.5.
10. the rear step type flame holder that rotary engine according to claim 1 is used, it is characterized in that: the step head windward side (21) of described rear step type flame holder (10), step head mount pad windward side (23), the windward side (26) of step bottom mount pad all is designed to chamfering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101149766A CN101329072B (en) | 2008-06-16 | 2008-06-16 | Rear step type flame holder for rotor engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101149766A CN101329072B (en) | 2008-06-16 | 2008-06-16 | Rear step type flame holder for rotor engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101329072A CN101329072A (en) | 2008-12-24 |
| CN101329072B true CN101329072B (en) | 2010-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101149766A Expired - Fee Related CN101329072B (en) | 2008-06-16 | 2008-06-16 | Rear step type flame holder for rotor engine |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8387391B2 (en) * | 2010-12-17 | 2013-03-05 | General Electric Company | Aerodynamically enhanced fuel nozzle |
| CN107504517B (en) * | 2017-08-15 | 2023-09-29 | 南京航空航天大学 | Step type center cone with circumferential staggered terrace |
| CN115164234B (en) * | 2022-05-12 | 2023-06-13 | 中国航发四川燃气涡轮研究院 | Afterburner flame stabilizer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101144430A (en) * | 2007-10-19 | 2008-03-19 | 北京航空航天大学 | Tower type flame holder for rotor engine |
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2008
- 2008-06-16 CN CN2008101149766A patent/CN101329072B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101144430A (en) * | 2007-10-19 | 2008-03-19 | 北京航空航天大学 | Tower type flame holder for rotor engine |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平6-185732A 1994.07.08 |
| JP特开平6-272618A 1994.09.27 |
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| CN101329072A (en) | 2008-12-24 |
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